Revert "ci: use release_created consistently in single-package repo"

This reverts commit 31b6111.

Author: keelerm84

.github/workflows/release-please.yml

@@ -11,7 +11,7 @@ jobs:
       contents: write
       pull-requests: write
     outputs:
-      release_created: ${{ steps.release.outputs.release_created }}
+      releases_created: ${{ steps.release.outputs.releases_created }}
     steps:
       # Create any releases first, then create tags, and then optionally create any new PRs.
       - uses: googleapis/release-please-action@16a9c90856f42705d54a6fda1823352bdc62cf38 # v4.4.0
@@ -47,7 +47,7 @@ jobs:
 
   release-package:
     needs: release-please
-    if: ${{ needs.release-please.outputs.release_created == 'true' }}
+    if: ${{ needs.release-please.outputs.releases_created == 'true' }}
     runs-on: ubuntu-latest
     permissions:
       id-token: write # Needed if using OIDC to get release secrets.